handleServiceErrorCodes.go

Handling Errors in the AWS SDK for Go.

/*
Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
This file is licensed under the Apache License, Version 2.0 (the "License").
You may not use this file except in compliance with the License. A copy of
the License is located at
http://aws.amazon.com/apache2.0/
This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied. See the License for the
specific language governing permissions and limitations under the License.
*/
package main
import (
"fmt"
"os"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}
// Will make a request to S3 for the contents of an object. If the request
// was successful, and the object was found the object's path and size will be
// printed to stdout.
//
// If the object's bucket or key does not exist a specific error message will
// be printed to stderr for the error.
//
// Any other error will be printed as an unknown error.
//
// Usage: handleServiceErrorCodes <bucket> <key>
func main() {
if len(os.Args) < 3 {
exitErrorf("Usage: %s <bucket> <key>", filepath.Base(os.Args[0]))
}
sess := session.Must(session.NewSession())
svc := s3.New(sess)
resp, err := svc.GetObject(&s3.GetObjectInput{
Bucket: aws.String(os.Args[1]),
Key: aws.String(os.Args[2]),
})
if err != nil {
// Casting to the awserr.Error type will allow you to inspect the error
// code returned by the service in code. The error code can be used
// to switch on context specific functionality. In this case a context
// specific error message is printed to the user based on the bucket
// and key existing.
//
// For information on other S3 API error codes see:
// http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
if aerr, ok := err.(awserr.Error); ok {
switch aerr.Code() {
case s3.ErrCodeNoSuchBucket:
exitErrorf("bucket %s does not exist", os.Args[1])
case s3.ErrCodeNoSuchKey:
exitErrorf("object with key %s does not exist in bucket %s", os.Args[2], os.Args[1])
}
}
exitErrorf("unknown error occurred, %v", err)
}
defer resp.Body.Close()
fmt.Printf("s3://%s/%s exists. size: %d\n", os.Args[1], os.Args[2],
aws.Int64Value(resp.ContentLength))
}

Sample Details

Service: sdk-for-go

Last tested: 2018-03-16

Author: Doug-AWS

Type: full-example

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